Initializing uplink power in a wireless network

Abstract

A wireless device receives a media access control (MAC) activation command indicating activation of a physical uplink control channel (PUCCH) secondary cell. The wireless device initializes an adjustment factor employing a transmit power control value received in a random access response if the wireless device transmits a random access preamble on the PUCCH secondary cell, otherwise initializes the adjustment factor to zero. The wireless device transmits a first instance of uplink control information on the secondary PUCCH with an initial transmit power computed employing the adjustment factor.

What is claimed is: 
     
       1. A method comprising:
 receiving, by a wireless device, at least one message comprising configuration parameters of a physical uplink control channel (PUCCH) secondary cell with a secondary PUCCH; and 
 receiving a media access control (MAC) activation command indicating activation of the PUCCH secondary cell; 
 transmitting first uplink control information (UCI) on the secondary PUCCH employing an adjustment factor, wherein the adjustment factor is updated in response to the wireless device receiving at least one first transmit power control (TPC) command for the secondary PUCCH; 
 receiving, on a common search space of a primary cell, at least one second TPC command of the secondary PUCCH, when the PUCCH secondary cell is activated and is assigned to a timing advance group whose time alignment timer is not running; 
 ignoring the at least one second TPC command, in response to the PUCCH secondary cell being assigned to the timing advance group whose time alignment timer is not running; 
 initializing the adjustment factor employing a transmit power control value received in a random access response if the wireless device transmits a random access preamble on the PUCCH secondary cell, otherwise initializing the adjustment factor to zero; and 
 transmitting second UCI on the secondary PUCCH with a transmit power computed employing the adjustment factor. 
 
     
     
       2. The method of  claim 1 , wherein the at least one message comprises configuration parameters of a plurality of cells grouped into a plurality of PUCCH groups, the plurality of PUCCH groups comprising:
 a primary PUCCH group comprising a primary cell with a primary PUCCH transmitted to a base station; and 
 a secondary PUCCH group comprising the PUCCH secondary cell with the secondary PUCCH transmitted to the base station. 
 
     
     
       3. The method of  claim 1 , wherein the random access response is received on a primary cell. 
     
     
       4. The method of  claim 1 , wherein the at least one message comprises random access resource parameters of the PUCCH secondary cell. 
     
     
       5. The method of  claim 1 , further comprising computing the initial transmit power employing one or more second PUCCH power control IEs, wherein the at least one message comprises:
 the one or more PUCCH information elements (IEs) indicating one or more PUCCH formats of the secondary PUCCH; and 
 the one or more second PUCCH power control IEs indicating a power parameter value of at least one of the one or more PUCCH formats. 
 
     
     
       6. The method of  claim 1 , wherein the initializing the adjustment factor further comprises employing at least one power ramp-up value if the wireless device transmits the random access preamble. 
     
     
       7. The method of  claim 1 , wherein the first instance of uplink control information is transmitted after receiving the random access response. 
     
     
       8. The method of  claim 1 , wherein the at least one message further comprises a pathloss reference parameter indicating a pathloss reference cell for the PUCCH secondary cell. 
     
     
       9. The method of  claim 1 , wherein the PUCCH secondary cell is initially deactivated when configured. 
     
     
       10. A wireless device comprising:
 one or more processors; and 
 memory storing instructions that, when executed, cause the wireless device to: 
 receive at least one message comprising configuration parameters of a physical uplink control channel (PUCCH) secondary cell with a secondary PUCCH; and 
 receive a media access control (MAC) activation command indicating activation of the PUCCH secondary cell; 
 transmit first uplink control information (UCI) on the secondary PUCCH employing an adjustment factor, wherein the adjustment factor is updated in response to the wireless device receiving at least one first transmit power control (TPC) command for the secondary PUCCH; 
 receive, on a common search space of a primary cell, at least one second TPC command of the secondary PUCCH, when the PUCCH secondary cell is activated and is assigned to a timing advance group whose time alignment timer is not running; 
 ignore the at least one second TPC command, in response to the PUCCH secondary cell being assigned to the timing advance group whose time alignment timer is not running; 
 initialize the adjustment factor employing a transmit power control value received in a random access response if the wireless device transmits a random access preamble on the PUCCH secondary cell, otherwise initializing the adjustment factor to zero; and 
 transmit second UCI on the secondary PUCCH with transmit power computed employing the adjustment factor. 
 
     
     
       11. The wireless device of  claim 10 , wherein the at least one message comprises configuration parameters of a plurality of cells grouped into a plurality of PUCCH groups comprising:
 a primary PUCCH group comprising a primary cell with a primary PUCCH transmitted to a base station; and 
 a secondary PUCCH group comprising the PUCCH secondary cell with the secondary PUCCH transmitted to the base station. 
 
     
     
       12. The wireless device of  claim 10 , wherein the random access response is received on a primary cell. 
     
     
       13. The wireless device of  claim 10 , wherein the at least one message comprises random access resource parameters of the PUCCH secondary cell. 
     
     
       14. The wireless device of  claim 10 , wherein:
 the at least one message comprises:
 one or more PUCCH information elements (IEs) indicating one or more PUCCH formats of the secondary PUCCH; and 
 one or more second PUCCH power control IEs indicating a power parameter value of at least one of the one or more PUCCH formats; 
 
 the instructions, when executed, further cause the wireless device to compute the initial transmit power employing the one or more second PUCCH power control IEs. 
 
     
     
       15. The wireless device of  claim 10 , wherein the instructions, when executed, further cause the wireless device to initialize the adjustment factor employing at least one power ramp-up value if the wireless device transmits the random access preamble. 
     
     
       16. The wireless device of  claim 10 , wherein the first instance of uplink control information is transmitted after receiving the random access response. 
     
     
       17. The wireless device of  claim 10 , wherein the at least one message further comprises a pathloss reference parameter indicating a pathloss reference cell for the PUCCH secondary cell. 
     
     
       18. The wireless device of  claim 10 , wherein the PUCCH secondary cell is initially deactivated when configured.